@gertie, what a wonderful report! I agree with everything that's been stated, so can't add much other than another Kneerah! Both your recoveries continue to amaze me!
I know what you mean about being fearful of sliding down into couch-potatodom, but...I don't believe you will. You have too many activities you enjoy, even if you can't do them just yet. I make myself take short walks each day (15 minutes, each dog) or the market, and ride my bike 2x a day for about 5 minutes. Other than that, my many stairs are my exercise. I can't quite recall when I ditched the raised toilet seat, but I think it was fairly early (8-10 weeks perhaps?) because it made my small bathroom rather crowded. I don't have a comfort height toilet, and boy, did the that feel LOW at first! However, it didn't bother my knee, it was my out of shape thighs that took the heat. I'd say it took about 2 weeks to be able to use it with relative ease.
I wish I had an answer to your sleeping difficulties other than talking to your PCP, but I do not. If you had trouble with sleeping prior to both surgeries, it's not really surprising it's still a problem, eh? I can certainly understand your concerns about returning to work full-time and in the office, as opposed to home. I'm sure that will be a big challenge initially, but you have risen to every challenge presented with the knees, so I imagine you'll handle this one as well. Perhaps that will be the ticket to better sleep; who knows?
Congratulations on entertaining! It's rather exhausting, isn't it? Still, what a great milestone to have achieved; woot!